Climacteric fruits produce much larger amount of ethylene than non climacteric fruits.
In simple terms ,
Climacteric fruits ripen when harvested and kept outside , but Non climacteric fruits do not ripen after harvesting from the plant
Climacteric fruits are --> Mango, Banana, Sapota, Guava, Papaya, Apple, Fig, Peach, Pear, Plum, Annona,Tomato
Non Climacteric fruits are --> Citrus, Grape, Pomegranate Pineapple Litchi, Ber, Jamun, Cashew, Cucumber, Cherry, Strawberry